CN202993605U - Heat reservoir for reserving solar energy and solar utilization device - Google Patents
Heat reservoir for reserving solar energy and solar utilization device Download PDFInfo
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- CN202993605U CN202993605U CN2012205954239U CN201220595423U CN202993605U CN 202993605 U CN202993605 U CN 202993605U CN 2012205954239 U CN2012205954239 U CN 2012205954239U CN 201220595423 U CN201220595423 U CN 201220595423U CN 202993605 U CN202993605 U CN 202993605U
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- tube
- metal tube
- pipe
- storage device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
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Abstract
An embodiment of the utility model relates to the technical field of solar energy utilization, and discloses a heat reservoir for reserving solar energy and a solar-energy utilization device, aiming to prevent reserved solar energy against quick dissipation and to generate the solar energy conveniently. The heat reservoir for reserving the solar energy comprises a glass vacuum tube, a metal tube and a circulating tube. The glass vacuum tube is one blind tube with one closing end and one opening end. The metal tube is also one blind tube with one closing end and one opening end, and is sleeved in the glass vacuum tube. The opening direction of the metal tube is identical to that of the glass vacuum tube. The circulating tube is communicated with a cavity in the metal tube. The heat reservoir and the solar utilization device are adaptable to places utilizing the solar energy.
Description
Technical field
The utility model relates to the helioplant technical field, relates in particular to the heat energy thermal storage device of the solar energy in helioplant.
Background technology
Helioplant refers to the solar energy system that can produce a large amount of hot water or steam by the subsystems such as solar thermal collector, pipeline, thermal storage device, electrical equipment control tracking composition, is commonly called as to be " solar boiler ".Have now between solar thermal collector used in helioplant and thermal storage device and be connected by circulation water inlet pipe and recycling outlet.Correspondingly, offer respectively circulation water inlet and circulating outlet on thermal storage device, the circulation water inlet is connected with the circulation water inlet pipe, and circulating outlet is connected with recycling outlet.
The thermal storage device of helioplant in prior art adopts the form of common water tank, by plurality of steel plates one by one assembly unit be welded, its manufacturing process is not only complicated, and is easy to the external world, heat exchange occur, thereby causes stored heat to scatter and disappear quickly.
The utility model content
A technical problem to be solved in the utility model is to provide a kind of thermal storage device for the solar energy storage, can either avoid stored solar energy to scatter and disappear quickly, is convenient to again make.
For achieving the above object, the thermal storage device embodiment that the utility model is used for the solar energy storage adopts following technical scheme:
A kind of thermal storage device for the solar energy storage comprises:
Glass-vacuum tube, described glass-vacuum tube are the blind pipe that an end sealing other end has opening;
Metal tube, described metal tube are also the blind pipe that an end sealing other end has opening; Described metal tube is set in described glass-vacuum tube, and the opening direction of described metal tube is consistent with the opening direction of described glass-vacuum tube;
Lid is arranged on the opening part of described metal tube;
Circulating water pipe is plugged on described lid and is connected with the cavity of described metal tube inside.
Further, described glass-vacuum tube comprises outer glass pipe and inner glass tube, and outer glass pipe is in the same place at the mouth of pipe sealing by fusing of described opening part with inner glass tube; Has vacuum interlayer between outer glass pipe and inner glass tube;
Be provided with infrared reflection film between the outer wall of described metal tube and the inwall of described inner glass tube, and/or be provided with infrared reflection film in the outer glass pipe outside of described glass-vacuum tube.
Further, be coated with protective layer in described glass-vacuum tube outside.
Further, described circulating water pipe comprises circulation water inlet pipe and recycling outlet, and described circulation water inlet pipe is set in described recycling outlet.
Further, also be inserted with vapour-discharge tube on described lid, described vapour-discharge tube penetrates described recycling outlet, and is set in side by side in described recycling outlet with described circulation water inlet pipe.
Further, described metal tube is opening down; Described vapour-discharge tube is at the opening of described metal tube inside, higher than the opening of described circulation water inlet pipe in described metal tube inside; Described circulation water inlet pipe is at the opening of described metal tube inside, higher than the opening of described recycling outlet in described metal tube inside.
Further, described thermal storage device also comprises filling pipe, and described filling pipe is connected with described recycling outlet.
Another technical problem to be solved in the utility model is to provide a kind of helioplant, can either avoid stored solar energy to scatter and disappear quickly, is convenient to again make.
For achieving the above object, the utility model helioplant embodiment adopts following technical scheme:
A kind of helioplant, comprise: solar thermal collector and solar energy heat-storage device, be connected with circulating water pipe between described solar thermal collector and solar energy heat-storage device, this circulating water pipe is connected the cavity of the cavity of described solar thermal collector inside and described metal tube inside; Described solar energy heat-storage device is the described thermal storage device for the solar energy storage of aforementioned any one.
Further, the circulating water pipe that connects between described solar thermal collector and solar energy heat-storage device is flexible duct, and described circulating water pipe comprises: outer circulation pipeline and the internal recycle pipeline that is set in described outer circulation pipeline inside.
Further, the metal tube of described thermal storage device opening down, and described thermal storage device be arranged on described solar thermal collector directly over.
Further, in described internal recycle pipeline, perhaps be equiped with heat pipe between the inwall of the outer wall of described internal recycle pipeline and described outer circulation pipeline; One end of described heat pipe is arranged on the position near described solar thermal collector.
Beneficial effect:
In above-mentioned each scheme of the utility model, water can enter in described metal tube by described circulating water pipe through after solar energy heating, constantly recirculated water is heated through solar energy, and the heat energy of solar energy will constantly be stored in described metal tube.Owing to being set in glass-vacuum tube at described metal tube, make metal tube to be isolated with external environment condition, greatly reduced the thermal-radiating diffusion of metal tube, prevent that the heat of storing in metal tube scatters and disappears quickly; Because described metal tube is again blind pipe, only passed in and out described metal tube by an openend of metal tube by the aqueous medium of solar energy heating, for the heat storage box of offering respectively at least two openings at diverse location of the prior art, can prevent further that again stored heat energy scatters and disappears quickly; In addition, described glass-vacuum tube is blind pipe, can directly adopt in prior art existing glass-vacuum tube to use, and the opening direction of described metal tube is consistent with the opening direction of described glass-vacuum tube, during assembling, only need the cecum of two blind pipes is set-located to openend ground to cecum, openend, and encapsulate simply and get final product, make like this making of thermal storage device simply and fast.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the cross-sectional view that embodiment of the present utility model is used for the thermal storage device of solar energy storage;
Fig. 2 is the structural representation of glass-vacuum tube in Fig. 1;
Fig. 3 is the structural representation of metal tube in Fig. 1;
Fig. 4 is the structural representation of embodiment helioplant of the present utility model.
The specific embodiment
Be described in detail for the thermal storage device of solar energy storage and the specific embodiment of helioplant the utility model is a kind of below in conjunction with accompanying drawing.
Should be clear and definite, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making all other embodiment that obtain under the creative work prerequisite, all belong to the scope of the utility model protection.
Referring to Fig. 1 and shown in Figure 3, the utility model specific embodiment provides a kind of thermal storage device for the solar energy storage, comprising: glass-vacuum tube 1, described glass-vacuum tube are the blind pipe that an end sealing other end has opening; Metal tube 2, described metal tube are also the blind pipe that an end sealing other end has opening; Described metal tube 2 is set in described glass-vacuum tube 1, and the opening direction of described metal tube is consistent with the opening direction of described glass-vacuum tube; Lid 9 is arranged on the opening part of described metal tube; Circulating water pipe 3 is plugged on described lid and is connected with the cavity of described metal tube 2 inside.
Glass-vacuum tube wherein can adopt directly that in prior art, existing glass-vacuum tube uses.Its internal height vacuum plays a role in insulation.
Wherein, adopt metal tube can bear larger pressure, preferably, described metal tube adopts stainless steel tube.The openend of metal tube is fixed by airtight and watertight padding 4 and the openend of glass-vacuum tube, and the other end is free shape in the cecum at glass-vacuum tube, and supports by support component 5, prevents from colliding with glass-vacuum tube.The metal tube other end is the design of free shape in the cecum of glass-vacuum tube, can solve glass-vacuum tube and the inconsistent problem of metal tube thermal expansion, is conducive to the cover glass vacuum tube.
Airtight and watertight padding 4 should be selected the good heat-resisting heat-insulating material of plasticity, prevents that extraneous air from bleeding, and makes the openend of glass-vacuum tube and the openend of metal tube fix simultaneously.
The utility model is used for the specific embodiment of the thermal storage device of solar energy storage, water is through after solar energy heating, can enter in described metal tube 2 by described circulating water pipe 3, constantly recirculated water is heated through solar energy, the heat energy of solar energy will constantly be stored in described metal tube 2.Owing to being set in glass-vacuum tube 1 at described metal tube 2, make metal tube 2 to be isolated with external environment condition, greatly reduced the thermal-radiating diffusion of metal tube, prevent that the interior heat of storing of metal tube 2 scatters and disappears quickly; Because described metal tube 2 is again blind pipe, only passed in and out described metal tube 2 by an openend of metal tube 2 by the aqueous medium of solar energy heating, for the heat storage box of offering respectively at least two openings at diverse location of the prior art, can prevent further that again stored heat energy scatters and disappears quickly; In addition, described glass-vacuum tube 1 is blind pipe, can directly adopt in prior art existing glass-vacuum tube to use, and the opening direction of described metal tube 2 is consistent with the opening direction of described glass-vacuum tube 1, during assembling, only need the cecum of two blind pipes is set-located to openend ground to cecum, openend, and encapsulate simply and get final product, make like this making of thermal storage device simply and fast.
In previous embodiment, described glass-vacuum tube 1 comprises outer glass pipe 11 and inner glass tube 12, and outer glass pipe 11 is in the same place at the mouth of pipe sealing by fusing of described opening part with inner glass tube 12; Has vacuum interlayer 13 between outer glass pipe 11 and inner glass tube 12; Passive clamp 14 also can be set between outer glass pipe 11 and inner glass tube 12; Be provided with infrared reflection film 6 between the inwall of the outer wall of described metal tube 2 and described inner glass tube 12, can prevent the loss because of the interior stored heat of the thermal-radiating metal tube 2 that causes to external diffusion of metal tube 2.In addition, this infrared reflection film 6 can also play the effect of cushion pad, prevents directly collision or impact between metal tube 2 and glass-vacuum tube 1.
For preventing the loss because of the interior stored heat of the thermal-radiating metal tube 2 that causes to external diffusion of metal tube 2, also can be at the outer glass pipe 11 outer setting infrared reflection films 7 of described glass-vacuum tube 1.Certainly, in order to reach effect of heat insulation preferably, can be simultaneously between the inwall of the outer wall of described metal tube 2 and described inner glass tube 12, reach in outer glass pipe 11 outsides of described glass-vacuum tube 1 infrared reflection film be set simultaneously.
In previous embodiment, preferably, be coated with protective layer 8 in described glass-vacuum tube 1 outside.Described protective layer can adopt insulation material to make, and makes as adopting the materials such as polyurethane, can further play like this insulation effect, can play protective action to glass-vacuum tube 1 again, prevents that it is subjected to External Force Acting and damages.
The circulating water pipe 3 that plugs on described lid 9 can be a pipe, and namely cold water and hot water carry out thermal cycle and heat exchange by same pipe.The utility model is not limited to this, and described circulating water pipe 3 can be also two pipes, and one of them pipe is the circulation water inlet pipe, and another pipe is recycling outlet, and two pipes form the water circuit loop together.After absorbing hot water self-loopa water inlet pipe after solar energy and entering metal tube, carry out heat exchange with cold water in metal tube; Cold water self-loopa outlet pipe in metal tube 2 flows out, and arrives the new solar energy of solar energy heat-storage device place's absorption, and through so constantly water circulation and heat exchange, solar energy can constantly store up in described metal tube.
Preferably, described circulating water pipe 3 comprises recycling outlet 31 and circulation water inlet pipe 32, and described circulation water inlet pipe 32 is set in described recycling outlet 31.The heat that distributes of hot water in circulation water inlet pipe 32 cold water that can be recycled in outlet pipe 31 absorbs like this, avoided heat loss that the hot water in circulation water inlet pipe 32 distributes in air, make thus the temperature of the water in the whole circulatory system to rise quickly, thereby can store up solar energy quickly.
In previous embodiment, can the hot water of storing in thermal storage device be utilized.When the hot water temperature who stores in thermal storage device is higher, can form high-temperature steam in thermal storage device, at this moment, also can utilize this high-temperature steam.Correspondingly be inserted with vapour-discharge tube 30 on described lid 9.Preferably, described vapour-discharge tube 30 penetrates described recycling outlet from described metal tube 2 outsides, and is set in side by side in described recycling outlet with described circulation water inlet pipe 32.Like this, also can complete utilization to the steam that stores up by described same opening, prevent at the thermal storage device opening too much, cause heat easily to scatter and disappear.
In previous embodiment, preferably, described metal tube 2 opening down; Described vapour-discharge tube 33 is at the opening of described metal tube 2 inside, higher than the opening of described circulation water inlet pipe 32 in described metal tube 2 inside; Described circulation water inlet pipe 32 is at the opening of described metal tube 2 inside, higher than the opening of described recycling outlet 31 in described metal tube 2 inside.Like this, when described thermal storage device is arranged on the solar thermal collector top, be conducive to the thermal cycle of current and carrying out smoothly of heat exchange, and the discharge utilization that is beneficial to high-temperature steam.
In previous embodiment, preferably, for the ease of moisturizing in described thermal storage device, described thermal storage device also comprises filling pipe 34, and preferably, described filling pipe 34 is connected with described recycling outlet 31.Like this, also can complete moisturizing in the described thermal storage device by described same opening.
Referring to shown in Figure 4, the utility model specific embodiment also provides a kind of helioplant, comprise: solar thermal collector 21 and solar energy heat-storage device 40, be connected with circulating water pipe 23 between described solar thermal collector 21 and solar energy heat-storage device 40, this circulating water pipe 23 is connected the cavity of the cavity of described solar thermal collector 21 inside and described solar energy heat-storage device 40 inside; Described solar energy heat-storage device 40 is the described thermal storage device of aforementioned arbitrary embodiment.
Wherein, described solar thermal collector 21 is arranged on the support 20 of Salar light-gathering cover (as the parabolic concentrator cover), snoot is made (such as polished aluminum) by the infrared reflection material, has high reflectivity, infrared ray and visible light closely absolutely can be reflexed to focus axis place, namely reflex on solar thermal collector.Autotracker has two kinds of following functions: snoot can be under the control of autotracker, and rotation is followed the tracks of and follow the tracks of at the whole elevation angle.Described autotracker is comprised of sunlight probe, signal controller, power supply, CD-ROM drive motor and mechanical actuating mechanism etc.
The utility model is used for the specific embodiment of helioplant, water is through after solar energy heating, can enter in described metal tube 2 by described circulating water pipe 23, constantly recirculated water is heated through solar energy, the heat energy of solar energy will constantly be stored in described metal tube 2.Owing to being set in glass-vacuum tube 1 at described metal tube 2, make metal tube 2 to be isolated with external environment condition, greatly reduced the thermal-radiating diffusion of metal tube, prevent that the interior heat of storing of metal tube 2 scatters and disappears quickly; Because described metal tube 2 is again blind pipe, only passed in and out described metal tube by an openend of metal tube by the aqueous medium of solar energy heating, for the heat storage box of offering respectively at least two openings at diverse location of the prior art, can prevent further that again stored heat energy scatters and disappears quickly; In addition, described glass-vacuum tube 1 is blind pipe, can directly adopt in prior art existing glass-vacuum tube to use, and the opening direction of described metal tube is consistent with the opening direction of described glass-vacuum tube, during assembling, only need the cecum of two blind pipes is set-located to openend ground to cecum, openend, and encapsulate simply and get final product, make like this making of thermal storage device simply and fast.
In the specific embodiment of aforementioned helioplant, preferably, the circulating water pipe 23 that connects between described solar thermal collector 21 and solar energy heat-storage device 40 is flexible duct, and described circulating water pipe 23 comprises: 231 outer circulation pipelines and the internal recycle pipeline 232 that is set in described outer circulation pipeline inside.Water is in cyclic process like this, the heat that hot water in internal recycle pipeline 232 distributes can be absorbed by the cold water in outer circulation pipeline 231, the heat loss of having avoided distributing is in air, make thus the temperature of the water in the whole circulatory system to rise quickly, thereby can accumulate solar energy quickly.
In the specific embodiment of aforementioned solar steam generator, described thermal storage device 40 can arrange arbitrarily by solar thermal collector 21 relatively described according to on-the-spot needs.Be simplified apparatus, reduce system cost, preferably, described thermal storage device is arranged on the top of described solar thermal collector.Like this, the water in thermal storage device 40 can under himself action of gravitation, flow into described solar thermal collectors 21 along described outer circulation pipeline 231; And the water in described solar thermal collector 21 is subjected to the heating of solar energy and temperature raises, and automatically enters in described thermal storage device 40 along described internal recycle pipeline 232 under the effect of self buoyancy.Be not required to be thus the water circulation that realizes between described solar thermal collector and described thermal storage device and power and the control appliance thereof such as additional configuration water pump again, reduced cost.
Further preferably, the metal tube of described thermal storage device 40 opening down, and described thermal storage device 40 be arranged on described solar thermal collector 21 directly over.Can shorten the length of the flexible duct between described solar thermal collector and thermal storage device like this, be conducive to further reduce costs.
Referring to shown in Figure 4, in arctic weather, described flexible duct 23 usually causes pipeline blockage because freezing, and can't realize water circulation, thereby affect the extensive use of helioplant.In the specific embodiment of aforementioned helioplant, preferably, in described internal recycle pipeline 232, perhaps be equiped with heat pipe 24 between the inwall of the outer wall of described internal recycle pipeline 232 and described outer circulation pipeline 231; One end of described heat pipe 24 is arranged on the position near described solar thermal collector 21.Due to the conduction of heat of heat pipe 24, as long as solar thermal collector 21 is assembled the heat energy that sunshine is arranged, icing flexible duct 23 will thaw very soon, the unlikely application under cold environment that affects the utility model helioplant.
Referring to shown in Figure 4, in the specific embodiment of aforementioned helioplant, steam pipe 33 can be introduced high-temperature steam in building and be used, as enters steamer 50 with boiling of carrying out food etc.Described steam pipe 33 is positioned on an end of described external container pressure relieving valve is housed.
The above; it is only the specific embodiment of the present utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement are within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (10)
1. a thermal storage device that is used for the solar energy storage, is characterized in that, comprising:
Glass-vacuum tube, described glass-vacuum tube are the blind pipe that an end sealing other end has opening;
Metal tube, described metal tube are also the blind pipe that an end sealing other end has opening; Described metal tube is set in described glass-vacuum tube, and the opening direction of described metal tube is consistent with the opening direction of described glass-vacuum tube;
Lid is arranged on the opening part of described metal tube;
Circulating water pipe is plugged on described lid and is connected with the cavity of described metal tube inside.
2. thermal storage device according to claim 1, is characterized in that, described glass-vacuum tube comprises outer glass pipe and inner glass tube, and outer glass pipe is in the same place at the mouth of pipe sealing by fusing of described opening part with inner glass tube; Has vacuum interlayer between outer glass pipe and inner glass tube;
Be provided with infrared reflection film between the outer wall of described metal tube and the inwall of described inner glass tube, and/or be provided with infrared reflection film in the outer glass pipe outside of described glass-vacuum tube.
3. thermal storage device according to claim 1 and 2, is characterized in that, is coated with protective layer in described glass-vacuum tube outside.
4. thermal storage device according to claim 3, is characterized in that, described circulating water pipe comprises circulation water inlet pipe and recycling outlet, and described circulation water inlet pipe is set in described recycling outlet.
5. thermal storage device according to claim 4, is characterized in that, also is inserted with vapour-discharge tube on described lid, and described vapour-discharge tube penetrates described recycling outlet, and be set in side by side in described recycling outlet with described circulation water inlet pipe.
6. thermal storage device according to claim 5, is characterized in that, described metal tube opening down; Described vapour-discharge tube is at the opening of described metal tube inside, higher than the opening of described circulation water inlet pipe in described metal tube inside; Described circulation water inlet pipe is at the opening of described metal tube inside, higher than the opening of described recycling outlet in described metal tube inside.
7. helioplant, comprise: solar thermal collector and solar energy heat-storage device, be connected with circulating water pipe between described solar thermal collector and solar energy heat-storage device, this circulating water pipe is connected the cavity of the cavity of described solar thermal collector inside and described metal tube inside; It is characterized in that,
Described solar energy heat-storage device is the described thermal storage device for the solar energy storage of aforementioned claim 1-6 any one.
8. helioplant according to claim 7, it is characterized in that, the circulating water pipe that connects between described solar thermal collector and solar energy heat-storage device is flexible duct, and described circulating water pipe comprises: outer circulation pipeline and the internal recycle pipeline that is set in described outer circulation pipeline inside.
9. helioplant according to claim 7, is characterized in that, the metal tube of described thermal storage device opening down, and described thermal storage device be arranged on described solar thermal collector directly over.
10. helioplant according to claim 8, is characterized in that, in described internal recycle pipeline, perhaps is equiped with heat pipe between the inwall of the outer wall of described internal recycle pipeline and described outer circulation pipeline; One end of described heat pipe is arranged on the position near described solar thermal collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205954239U CN202993605U (en) | 2012-11-13 | 2012-11-13 | Heat reservoir for reserving solar energy and solar utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205954239U CN202993605U (en) | 2012-11-13 | 2012-11-13 | Heat reservoir for reserving solar energy and solar utilization device |
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| Publication Number | Publication Date |
|---|---|
| CN202993605U true CN202993605U (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012205954239U Expired - Fee Related CN202993605U (en) | 2012-11-13 | 2012-11-13 | Heat reservoir for reserving solar energy and solar utilization device |
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| Country | Link |
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| CN (1) | CN202993605U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629522A (en) * | 2013-12-05 | 2014-03-12 | 王文杰 | Large-sized solar steam storage |
| CN111156690A (en) * | 2020-01-14 | 2020-05-15 | 黄骅市铭砚环保科技有限公司 | Double-circulation step-by-step heating device |
-
2012
- 2012-11-13 CN CN2012205954239U patent/CN202993605U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629522A (en) * | 2013-12-05 | 2014-03-12 | 王文杰 | Large-sized solar steam storage |
| CN103629522B (en) * | 2013-12-05 | 2015-08-26 | 王炳祥 | A kind of large-sized solar steam accumulator |
| CN111156690A (en) * | 2020-01-14 | 2020-05-15 | 黄骅市铭砚环保科技有限公司 | Double-circulation step-by-step heating device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20141113 |
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| EXPY | Termination of patent right or utility model |